Expansive reamer.



No. 788,620. PATBNTED MAY 2, 1905.

. J. G. ADKINS.

EXPANSIVE REAMER.

APPLIGATION FILED 001224, 1904.

q 1 G' x m) $4 lHl n" 9 3 1 I 1 1a '5 Z ,1? i 14 l n""' W W" 441200 5 A I a STATES Patented May 2, 1905.

JOHN C. ADKINS, OF STOCKTON, CALIFORNIA.-

EXPANSIVE RE'AMER.

SPECIFICATION forming part of Letters Patent No. 788,620, dated May 2, 1905.

Application filed October 24, 1904:- Serial No- 229,675-

To all whom it many concern:

Be it known that I, J OHN C. ADKINS, acitizen of the United States, residing at Stockton, in the county of San Joaquin, State of California, have invented certain new and useful Improvements in Expansive Reamers; and I do declare the following to be afull, clear, and exact description of theinvention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the numerals of reference marked thereon, which form a part of this specification.

My invention relates to improvements in apparatus for boring wells, and particularly to that class designated as reamers; and it consists in the effective construction hereinafter set forth.-

My object is to produce an expansive reamer which will sufficiently ream and clear the hole, so that the casing may be easily inserted without a waste of energy or without reduction in size. This object 1 accomplish by the peculiar construction and adaptation of parts fully set forth in this specification and particularly pointed out in the claims appended.

In order that my invention may be readily understood and easily carried into effectl will proceed,aided by the accompanying drawings, fully to describe the same.

Referring to the drawings, Figure 1 is a longitudinal view of my improved reamer. Fig. 2 is a vertical section of the same.

Similar numerals of reference indicate corresponding parts in both views.

1 designates the casing of my improved reamer.

l is an ordinary bail riveted to the casing 1. 1" is a cable or chain attached to the same.

2 represents steel springs riveted to the casing 1 near the bottom thereof and extending downwardly therefrom, on the bottom of which springs are secured curved chisels 3.

1 represents small steel blocks cut integral to the springs 2 near the bottom thereof, said blocks being wider at the bottom than at the top.

5 represents small inwardly-extending lugs on the bottom of the blocks 4.

6 is a steel key located between the springs 2.

7 is an iron pin fastened into the head of the key 6.

8 is a piece of cast-iron exactly fitted into the casing 1 and surrounding the pin 7.

9 is a cap secured onto the top of the pin 7 and adapted to prevent the part 8 from slipping ofl the pin 7.

10 represents eyebolts suitably fastened to the top of the part 8. 11 represents cables or chains attached thereto.

12 is a chain fastened into the bottom of the key 6, on the bottom of which hangs a bell 13.

1 1 represents chains fastened into the bell 13 and one to each of the chisels 3.

On the outside of the casing 1 near the top thereof are riveted springs 15, and 16 represents small slots in the bottom of said springs.

17 represents small pins or screws inserted through the slots 16 and fastened in the easing 1.

The operation is as follows: The cables or chains 11 are held taut while the reamer fol lows the casing of the well down until it strikes the bottom. Then the said cables or chains 11 are loosened and the jar of the reamer striking the bottom causes the iron 8 to slip downward with great force. This drives the key 6 downward between the blocks 1, and this throws the springs 2 outward and the chisels 3 then ream the hole to a greater width than the width of the casing of the well and thus permit said casing to slip easily downward without reduction. hen the reamer comes to a stop, the part 8 is pulled upwardly by means of the cable 11 and pulls the key 6 back into its position, and this by means of the chains 12 and 1 1 pulls the said springs 2 back into position. The whole reamer is then pulled upward by means of the said cable or chain 1", and the reamer is ready for another drive,

Although I have shown a certain kind of mechanism for spreading the spring chisel meal'anism, still any which is adapted maybe use The lugs 5 act as stops for the key 6.

The springs 15 serve to hold the casing 1 tightly in the casing of the well and prevent it-from swinging, and thus entangling the l raising said casing and means for raising said chains or cables. The pins 17, working in the slots 16, are for the purpose of allowing the said springs to adapt themselves to the size of the casing of the well.

I have entered into a detailed description of the construction and relative arrangement of parts embraced'in the present and preferred embodiment of my invention. I do not desire, however, to be understood as confining myself to such specific detail, as such changes and modifications may be made in practice as fairly fall within the scope of my claims.

Having thus described my invention, what I claim as new and useful, and desire to protect by Letters Patent, is

1. In an apparatus of the kind described the combination of asuitable casing provided with a plurality of steel springs riveted to the outside of said casing near the bottom thereof and extending downwardly therefrom, suitable chisels fastened to the lower ends of said springs, steel blocks cast integral with the inside of said springs near the bottom thereof, inwardly-projecting lugs on the lower ends of said blocks, a suitable driving-key fitted between said springs, a pin fastened into the top of said key, a piece of cast-iron surrounding said pin, a cap on the top of said pin, a chain, secured in the bottom of said key, a bell on the lower end of said chain, chains connecting said bell to each of said chisels, means for key, pin, and iron, all as set forth.

2. In an apparatus of the kind described the combination of a suitable casing provided with a plurality of steel springs riveted to the outside of said casing near the bottom thereof and extending downwardly therefrom, suitable chisels fastened to the lower ends of said springs, steel blocks cast integral with the insides of said springs near the bottom thereof, inwardly-projecting lugs on the lower ends of said blocks, a suitable driving-key fitted between said springs, a pin fastened into the top of said key, a piece of cast-iron surrounding said pin, a cap on the top of said pin, a chain secured to the bottom of said key, a bell on the lower end of said chain, chains connecting the said bell to each of said chisels, means 5 to this specification in the presence of two subscribing witnesses.

JOHN CVADKINS.

Witnesses:

PERCY S. WEBsTER, JOSHUA B. VVEBsTER. 

